The odds that DNA on a bloody jacket found inside the home of a Jersey City murder suspect doesn’t belong to the couple he's accused of murdering is 1 in 1.23 quintillion, a forensics expert said in court today.

Jennifer Banaag, the forensics expert, testified for prosecutors this morning in the murder trial of Shiquan Bellamy that she tested several stains on the jacket, and found Mia Haqq's DNA in six of the nine stains and Michael Muchioki's DNA in three.

Bellamy, 22, is charged with gunning down Haqq, 25, and Muchioki, 27, in front of their Randolph Avenue apartment during a carjacking in April 2010. The couple was returning from their engagement party.

Authorities say they found the jacket, an oversized military camouflage coat, in a closet inside Bellamy’s apartment after the murders.

Bellamy, whose trial began last week and is expected to conclude as early as tomorrow, is charged with felony murder, murder, carjacking and weapons charges in the crime, officials say.

His previous trial ended in March in a mistrial when jurors deadlocked.